Ok so I have an appointment to give blood in about an hour.. and I forgot that I had planned for today to be a fast day (was going to just eat when I get home from work). And I don't take the juice and cookies they try to force on you after a donation.. Not sure if its such a good idea to give blood while fasting but I'm gonna give it a shot! It'll probably only be a few hours afterwards until I chow down.

I've done it twice in the past 4 months and I'm as normal as I was beforehand (which is to say, not very). I didn't fast the whole day though, just my normal 15 or so hours that day. The first time the girl was begging me to eat something. I'm like "No, seriously, I'm fine." I figure a better alternative is "I'm gluten intolerant and I hate raisins. I have food with me in the car."

Just wait 10-15 minutes in the "canteen" after you're done, and note how you feel after you stand up after waiting (ie. lightheaded). Take your own food with you if you need it (real fruit or a Larabar works pretty easy).